Abstract
The microscopic and macroscopic structure of brown rice kernel determines that it is a complex bio-material. Therefore, revealing kernel structural characteristics and fracture mechanisms can provide a reference for related processing application situations. In this study, an in-situ observation method with the multi-layer structure optical platform was developed to better understand the kernel fracture behavior. SEM images show that the starch structure distribution inside the endosperm layer could be divided into core, transition and outer layers. Meanwhile, kernel interior crack formation mechanism was revealed under quasi-static compression and verified from the perspective of fracture and structural mechanics. Typical kernel contact surface expansion behavior under compression conditions was analyzed. The results indicate that the compressive strength of glutinous kernel (56.3 MPa) larger than indica (48.1 MPa), and it was affected by kernel surface dimension and microscopic structure. The study aims to in-depth analysis fracture mechanism of brown rice kernel during the processing, providing a methodological reference for bio-material fracture.
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